Hi All, We use exchange server 2003 on Windows 2000 server in my office. Our arrangement is this: 1. Our emails from the internet come through our hosting provider and are colected into a mailbox. 2. At the perimeter network of the office,we have a server that runs Mdaemon v9.6 - this server POPs all the emails fromour provider and send to our exchange server on the internal network. This server also do a conversion from the domainname registered on the internet to the internal domain name before sending the mails to the exchange. Now my problem is - I enabled auto response, it works for emails within the organisation but wont work for emails coming from the internet. I have enabled auto response for internet emails in the system manager. I'm just wondering, is it possible that my provider adds something to the packet that suppresses auto-response? Also note that I have used this before and it worked,and I've not changed anything in my configuration, so I wonder what is happening. I need all the help. Thanks.

Do Exchange send direct to Internet? you can see in SMTP logs or message tracking logs on Exchange if Exchange really sends OOF message to internet

NO, Exchange sends to a smart host on the perimeter network. The smart host runs mdaemon v9.6 I looked through the message tracking and there's no trace that exchange sent out any OOF. I looked at the header of one of the emails from internet and I noticed this "X-Return-Path: X-Envelope-From:" The return part was empty, does this mean anything? could this be the missing link? Because this is not missing for emails received from within and those ones get OOF. Thanks a lot for more help.

the header starts with X- , that means its not defined standard. My guessing is that Mdaemon insert this is header as a notification probably because the original message dont have those headers missing. what does MDaemon logs say about the message that originally came from internet?

Thanks a lot for your help. I don't think Mdaemon would add to or remove anything from the header. What I suspect is lastspam, the spam protection company hired by our provider to scam our emails and filter spam. So our emails from the internet travel thus: 1st to lastspam (where our MX record points to) then to practicalhost (our email service provider) then downloaded to our local servers Mdaemon and forwarded to exchange on the internal network. I suspect they remove the Return-part addressfrom the header so as to suppress or refuse to trigger autoresponse ( maybe a way to fight spam) IS THIS POSSIBLE? if yes then I suspect Lastspam. The reason I don't suspect Mdaemon is because I actually sent a mail from the mdaemon server using the default domain configured on it to the internal network and this email got autoresponse. and looking at the header, the return-path address is present. Thanks once again for your help. Jide

I'm still waiting for help on this issue. Onequestion please, The absense of this header value Return Path: can it cause an email to refuse to trigger autoresponse? or supress it in anyway? Please any info will highly be appreciated. Thanks.